In this mini-documentary, YouTube's 8-Bit Guy digs into the history and technical details of floppy disks and the drives that read them. If you've ever wondered whether 3.5-inch diskettes were really "floppy" inside, why notching holes in the edges of the diskette shells magically "unlocked" extra storage capacity, or why they made ker-chunk! sounds, this is 15 minutes of nerd heaven. Boot up:

(Public domain photo courtesy of George Chernilevsky, via Wikimedia Commons.)